I secretly hate my best friends, whenever I open up to them they make fun of me for being too sensitive and will feed off of each others mocking. I told them that I suffered from anger management and bipolar once, and they proceeded to laugh in my face an call me a liar and an attention seeker. I live with them and have no escape. It sucks because I don't feel like I can be completely honest with anyone, and I can't afford a therapist.

They are not even worth to be called best friends. You should move out and find yourself new ones. I had such "friends", too and trust me, those people will never change. Do yourself a favour and get away from them! Good luck.